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Data Sheet No : 106

Single (PG) and Multiple (MHM and MHC) Feedthroughs : Product data sheet No 106 (MHC) - 28405 PRODUCT DESCRIPTION

Multiple Probe Feedthrough Assembly

The MHC series of feedthroughs have been designed to allow multiple probes of identical diameters, access to a process vessel via a single entry. Sealing is based upon soft sealant technology and this employs various materials which take into consideration the process conditions in order to achieve this. When applying torque to the cap nut it forces the follower to move in a longitudinal direction. This in turn forces the sealant against an internal seat machined into the bore of the gland body. The resultant force causes the sealant to deform and close down on the probe/element and expand into the bore of the body produc-ing a pressure/vacuum barrier. On the MHC the fol-lower has an internal multi-hole insulator and a further similar insulator is placed in front of the sealant, this ensures that feedthroughs are isolated from the gland body. With the exception of Lava and Grafoil®, the other sealants are re-usable. Applications : thermocouples, RTD’s, analytical probes, sensor elements, capillary tubes. Product code : MHC Product code : MHC

S P E C I F I C A T I O N

Feedthrough body : machined from hexagonal bar stock and in 316 stainless steel (also available in Incoloy, Hastelloy and Monel). Sealants : Teflon®, Viton®, Neoprene, Lava or Grafoil®. Probe diameters : from 0.5 mm up to 3.18 mm (also available in Imperial sizes). Process connection : ”, ¼”, ½” and ¾” NPT depending on body size (BSP and other thread forms also available).
Operating range : Sealant Temperature range Pressure range at 20°C Teflon® -185 to +232°C Vacuum to 690 bar Viton® -20 to +232°C Vacuum to 690 bar Neoprene -40 to +93°C Vacuum to 690 bar Grafoil® -240 to +495°C Vacuum to 690 bar Lava -185 to +870°C 1 bar to 690 bar ©Thermal Detection 2007 Teflon® is a registered trademark of E I DuPont de Nemours. Viton® is a registered trademark of DuPont Dow Elastomers LLC. Grafoil® is a registered trademark of UCAR Carbon Company. Thermal Detection Limited Unit 6 Orde Wingate Way Primrose Hill Industrial Estate Stockton-on-Tees TS19 0GA England Tel : +44 1642 602878 Fax : +44 1642 618307 E-mail : tdl@thermal-detection.com Website : www.thermal-detection.com